更新时间:2026-05-20 GMT+08:00
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解密数据密钥 - DecryptDatakey

功能介绍

  • 功能介绍:解密数据密钥,用指定的主密钥解密数据密钥。

调用方法

请参见如何调用API

授权信息

账号具备所有API的调用权限,如果使用账号下的IAM用户调用当前API,该IAM用户需具备调用API所需的权限。

  • 如果使用角色与策略授权,具体权限要求请参见权限和授权项
  • 如果使用身份策略授权,需具备如下身份策略权限。

    授权项

    访问级别

    资源类型(*为必须)

    条件键

    别名

    依赖的授权项

    kms:cmk:decryptDataKey

    Write

    KeyId *

    • kms:KeyOrigin

    • kms:KeySpec

    • kms:KeyUsage

    • kms:MultiRegionKeyType

    • g:EnterpriseProjectId

    • g:ResourceTag/<tag-key>

    • kms:dek:crypto
    • kms:dek:decrypt

    -

    -

    • kms:RecipientAttestation

    • kms:RequestAlias

    • kms:ResourceAliases

    • kms:EncryptionContext

URI

POST /v1.0/{project_id}/kms/decrypt-datakey

表1 路径参数

参数

是否必选

参数类型

描述

project_id

String

参数解释:

项目ID。可参考获取项目ID获取。

约束限制:

不涉及

取值范围:

以IAM服务接口返回值为准,字符长度32-32。

默认取值:

不涉及

请求参数

表2 请求Header参数

参数

是否必选

参数类型

描述

X-Auth-Token

String

参数解释:

用户Token。 通过调用IAM服务查询用户Token接口获取(响应消息头中X-Subject-Token的值)。

约束限制:

不涉及

取值范围:

IAM服务查询用户Token接口为准

默认取值:

不涉及

表3 请求Body参数

参数

是否必选

参数类型

描述

key_id

String

参数解释:

密钥ID

约束限制:

  • 36字节ID

  • 满足正则匹配“^[0-9a-z]{8}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{12}$”

取值范围:

不涉及

默认取值:

不涉及

cipher_text

String

参数解释:

DEK密文及元数据的16进制字符串

约束限制:

取值为加密数据密钥结果中的cipher_text的值

取值范围:

不涉及

默认取值:

不涉及

datakey_plain_length

String

参数解释:

DEK明文字节长度

约束限制:

不涉及

取值范围:

1~1024

默认取值:

不涉及

additional_authenticated_data

String

参数解释:

身份验证的非敏感额外数据

约束限制:

长度不超过128字节

取值范围:

任意字符串

默认取值:

不涉及

sequence

String

参数解释:

请求消息序列号,36字节序列号,例如:919c82d4-8046-4722-9094-35c3c6524cff

约束限制:

不涉及

取值范围:

不涉及

默认取值:

不涉及

响应参数

状态码:200

表4 响应Body参数

参数

参数类型

描述

data_key

String

参数解释:

DEK明文的16进制字符串

取值范围:

不涉及

datakey_length

String

参数解释:

DEK明文字节长度

取值范围:

不涉及

datakey_dgst

String

参数解释:

DEK明文的SHA256值对应的16进制字符串

取值范围:

不涉及

请求示例

解密数据密钥,使用ID为“0d0466b0-e727-4d9c-b35d-f84bb474a37f”的密钥,解密明文长度为64字节的密文数据密钥,附加数据为“123aad”。

{
  "key_id" : "0d0466b0-e727-4d9c-b35d-f84bb474a37f",
  "cipher_text" : "020098005273E14E6E8E95F5463BECDC27E80AFxxxxxxxxxx...",
  "datakey_cipher_length" : "64",
  "additional_authenticated_data" : "123aad"
}

响应示例

状态码:200

请求已成功

{
  "data_key" : "000000e724d9cb35df84bb474a37fXXX...",
  "datakey_length" : "64",
  "datakey_dgst" : "F5A5FD42D16A20302798EF6ED3099XXX..."
}

SDK代码示例

SDK代码示例如下。

解密数据密钥,使用ID为“0d0466b0-e727-4d9c-b35d-f84bb474a37f”的密钥,解密明文长度为64字节的密文数据密钥,附加数据为“123aad”。

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package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.kms.v2.region.KmsRegion;
import com.huaweicloud.sdk.kms.v2.*;
import com.huaweicloud.sdk.kms.v2.model.*;


public class DecryptDatakeySolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        KmsClient client = KmsClient.newBuilder()
                .withCredential(auth)
                .withRegion(KmsRegion.valueOf("<YOUR REGION>"))
                .build();
        DecryptDatakeyRequest request = new DecryptDatakeyRequest();
        DecryptDatakeyRequestBody body = new DecryptDatakeyRequestBody();
        body.withAdditionalAuthenticatedData("123aad");
        body.withDatakeyCipherLength("64");
        body.withCipherText("020098005273E14E6E8E95F5463BECDC27E80AFxxxxxxxxxx...");
        body.withKeyId("0d0466b0-e727-4d9c-b35d-f84bb474a37f");
        request.withBody(body);
        try {
            DecryptDatakeyResponse response = client.decryptDatakey(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

解密数据密钥,使用ID为“0d0466b0-e727-4d9c-b35d-f84bb474a37f”的密钥,解密明文长度为64字节的密文数据密钥,附加数据为“123aad”。

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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkkms.v2.region.kms_region import KmsRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkkms.v2 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = KmsClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(KmsRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = DecryptDatakeyRequest()
        request.body = DecryptDatakeyRequestBody(
            additional_authenticated_data="123aad",
            datakey_cipher_length="64",
            cipher_text="020098005273E14E6E8E95F5463BECDC27E80AFxxxxxxxxxx...",
            key_id="0d0466b0-e727-4d9c-b35d-f84bb474a37f"
        )
        response = client.decrypt_datakey(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

解密数据密钥,使用ID为“0d0466b0-e727-4d9c-b35d-f84bb474a37f”的密钥,解密明文长度为64字节的密文数据密钥,附加数据为“123aad”。

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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    kms "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/kms/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/kms/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/kms/v2/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth, err := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        SafeBuild()

    if err != nil {
        fmt.Println(err)
        return
    }

    hcClient, err := kms.KmsClientBuilder().
         WithRegion(region.ValueOf("<YOUR REGION>")).
         WithCredential(auth).
         SafeBuild()


    if err != nil {
        fmt.Println(err)
        return
    }

    client := kms.NewKmsClient(hcClient)

    request := &model.DecryptDatakeyRequest{}
	additionalAuthenticatedDataDecryptDatakeyRequestBody:= "123aad"
	request.Body = &model.DecryptDatakeyRequestBody{
		AdditionalAuthenticatedData: &additionalAuthenticatedDataDecryptDatakeyRequestBody,
		DatakeyCipherLength: "64",
		CipherText: "020098005273E14E6E8E95F5463BECDC27E80AFxxxxxxxxxx...",
		KeyId: "0d0466b0-e727-4d9c-b35d-f84bb474a37f",
	}
	response, err := client.DecryptDatakey(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

更多编程语言的SDK代码示例,请参见API Explorer的代码示例页签,可生成自动对应的SDK代码示例。

状态码

状态码

描述

200

请求已成功

错误码

请参见错误码

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